Picture-projecting machine



Oct. 11,1927.

- P. A. NOTHSTINE PICTURE PHOJEQTING MACHINE 4 Sheets-Sheet 1 FilledJune 29, 1925 g-ninrnfoz Oct. 11,1927.

P. A. NOTHSTIN E PICTURE PROJECTING MACHINE 4 Sheets-Sheet 2 Filed June29, 1923 P. A; NOTHSTINE PICTURE PROJECTING MACHINE Fild June 29, 25

4 Sheets-Sheet 3 A TTORNE Y.

1645,204 11 1927- P. A. NOTHSTINE PICTURE PROJECTING MACHINE mean oa.11,1921.

rain. anornsrmn, or Darren, OHIO.

mcrunn -rnomcrme momma.

Application med June as, 1923. Seria1-No.648,416.

My invention relates to optics and more partlcularly to a projectinglantern for antomatically displaying upon a screen a repetitious programof enlarged pictorial illustrations, reading matter, advertisements andthe liLe.

The invention contemplates a projecting apparatus of the magic lanterntype as distinguished from cinematographic projections, wherein acontinuous succession of transparencies upon either an endless belt orrevoluble disc carrier are successively projected, the transparencycarrier being inter:

mittently advanced through ,step by step movement. In the presentembodiment the miniature transparencies are detachably andinterchangeably mounted upon the carrier to which movement is impartedby a pawl and ratchet, mechanism. In the present instance, the actuatingpawl has direct engagement with ratchet teeth upon the transparencycarrier to intermittently advance the same under the influence of aconstantly operating driving motor. The transparencies are employedeither in combination with or independent of a color screen, likewiseadvanced by the pawl and ratchet movement, but out of time with themovement of the transparencies whereby the color or tinge of thedisplayed matter may be varied. The

carrier disc is mounted upon peripheral guide rollers in such manner asto be readily removable for the substitution of a diiierent carrier andthe moving power is applied in such way as to minimize the tendency foroverthrow due to acquired momentum. An automatic shutter operatesquickly to its cut-ofi position when the transparency is to be advanced,but is retracted quite slowly in relation with its cut-0d movement.

The object of the invention is to simplify the structure as well as themeans and mode of operation of automatic projecting appara tus, wherebyit will not only be cheapened in construction, but will be moreefficient in operation, uniform in action, automatically controlled andunlikely to get out of repair. A further object of the invention is toprovide an improved form of step by step actuating mechanism, for thetraveling transparency, which will be simple but eiiicient, havingminimum number of parts and eliminating tendency for overthrow.

A further object of the invention is to provide a step by step operatingmechanism having direct engagement with the transparency the projectedmatter.

carrier, and capable of continuous operation for long eriods of timewithoiitattention.

A furt er object of the invention is to pro- -v1de means for combiningwith changeable 00 display transparencies a. variable color screen, bywhich the monotony of a repetitious program may be relieved throughconstantly changing color combinations, with A further object of theinvention is to provide an improved form-of cut-01f shutter' operable atdifferent speeds in its difierent directions of movement.

vention is to provide an improved form of mounting the travelingtransparency carrier.

With the above primary and other incident-a1 objects in view as willmore fully 7 appear in the specification, the invention consists of thefeatures of construction, the

parts and combinations thereof, and the mode of operation or theirequivalents as hereinafter described and set forth in the so claims.

Referring to the drawings, Fig. Tie a perspective view of the assembledproject ing devlce forming the subject matter hereof. Fig. 2 is alongitudinal sectional view on the axis of the lamp housing andprojecting lens. Fig. 3 is an interior view or rear elevation lookingforwardly and illustrating the step by step actuating mechanism for-thetraveling transparency. Fig. 4 is a detail view of, the motiontransmitting means illustrated in Fig. 3, but viewed in reversedirection. Fig. 5 is a detail view of one of the transparencies removedfrom the carrier. Fig. 6 is a transverse sectional view, 'through thetransparency carrier on line 66 of Fig. 4. Fig. 7 is a detail view ofthe pawl and ratchet actuating means, wherein the actuator is of duplexform, for actuating the transparency for movement in one di- 1 encycarrier and col-or screen or complementary transparency are operated inunison in the same direction. Fig. 9 is a vertical sectional viewillustrating the relation of the double disc transparencies and theactuating means shown in Fig. 7 Figs. 10 and 1 11 are front and reverseviews respectively, illustrating further modifications of the op- Afurther and important object of the in- 70 tail views of a modified formof feed gov- *ernor.

Like parts are indicated by similar characters of reference throughoutthe several views.

The projection lantern herein shown and described is designed primarilyas an automatic advertising device for use in hotels and publicbuildings, for announcing tram schedules and directions, window displaypurposes, and other purposes of analogous character. However, it isreadily adaptable for educational purposes, for displaying a successionof correlated pictures, reading matter and the like. The operating andprojecting mechanism is mounted in a compact housing or casing,comprising a circular projection chamber 1, from which ex: tendsrearwardly and in eccentric relation therewith a substantiallycylindrical lamp housing or illumination chamber 2. For

the purpose of heat radiation, the housing which is preferably thoughnot necessarily of metal, is provided with exterior radiating fins 3.The lamp housing 2 is formed integral with the rear wall 4 of theprojection chamber 1, to which it is detachably connected by screws,clamps or other locking means.

Loca-tedwithin the lamp housing or illumination chamber 2 is an electricbulb 5, mounted in a standard lamp socket 6, screw threaded in a flangedopening in the bottom of the lamp housing. For ventilating purposes, thelamp bulb is surrounded by a chimney 7, surmounted by a hood or cowl 8.At its rear side the chimney is provided with an opening 9, registeringwith a reflector 10 secured to the rear wall of the lamp housing. Thechimney is provided with a second opening 11 diametrically opposite theopening 9, and registering with a pair of condensing lenses 12,throughwhich the light is projected forwardly from the lamp bulb 5 andreflector 10. For ventilating purposes and to induce circulation of airwithin the lamp housing by which the walls are kept reasonably cool,there is provided an arcuate or semi-circular shield 13, arrangedtransversely within the lamp housing'and in spaced relation with thewalls thereof.

The condensing lenses 12 are mounted in a supporting ring 14, supportedconcentrically in relation with the lamp housing by radiall disposedarms or lugswhereby there is a orded a substantial ly annularventilating opening 15, about the periphery of the lens mounting ring14. v

Projecting from the forward wall of the projecting chamber 1 is a hub orsleeve 16, for the projection lenses. This hub or sleeve 16 iseccentrically positioned in relation with the chamber 1, but is axiallyalined with the lamp housing The matter to be projected, whether ofpictorial character or reading matter consists of a succession ofindependent detachable and interchangeable transparencies of miniatureform, arranged in an endless succession upon a rotary disc carrier 17.This carrier is mounted for rotary movement upon grooved rollers 18 and19 secured to the interior of the housing, with which the periphery ofthe disc is held in engagement by a third roller 20, carried upon aspring actuated oscillatory arm 21. The construc tion and relation ofthe guide rollers is such that upon the retraction of the swinging arm21 against the tension of its spring, the transparency carrier 17 may bereadily disengaged 'rom the supporting and guide rollers 18 anl 19. Thespring arm 21 causes the roller 20 to bear upon the periphery of thecarrier with suflicient' pressure or tension to insure. the retention ofthe engagement of" such transparency carrier 17 with its guide rollerswhile still allowing it to rotate reasonably free under the influence ofthe step by step actuator. As the transparency carrier 17 is advancedthe supporting rollers 18, 19 and 20 will rotate thereby minimizingfriction. The tension or bearing of the roller 20, however, will tifiorda slight braking effect, to prevent overthrow or acquired momentum ofthe carrier. The carrier 17 is light sheet metal and is annular in form.That is to say, is provided with a central circular opening ofcomparatively large diameter.- The annular carrier is provided with asuccession of spaced apertures 22. which serve toframe the miniaturetransparencies 23. These transparencies 23 are of mica, glass or othertransparent material to which the illustration or reading matter isapplied. The matter to be projected may be applied to such transparencyby any suitable means. However, the preferred method is to coat suchtransparencies with a photographic emulsion and photograph or printprepared display signs or pictorial illustrations on to suchtransparencies in reduced form. These transparencies may be colored bystains or transparent colors such as are ordinarily employed inproducing colored lantern slides. However, in lieu of coloring theslides directly, a preferred method is to employ such slide inconjunction with a variable color screen as will be hereafter described.As a simple and inexpensive method of detachably engaging thetransparencies with the carrier, the latter is provlded with oppositelydisposed preferably constructedof quite tongues or lugs 24, contiguousto the oppo- M site edges of the framing apertures 22. These tongues orlugs '24 are formed by projecting small areas of the sheet metal abletransparencies 23 to be introduced be-- neath such lugs or tongues.Tosecure the trans arencies 23 against displacement, the

-marg1ns of the transparencies are'provided with notches 26, whichregister with the tongues or lugs 24 upon the carrier. gThat is to say,the notched margins of the transparencies straddle the outturned lugs ortongues 24, which overhan the inner edges of the notches to a slightegree. By-buck ling or bending .the transparency 23, its

notched ends are readily engaged beneath or removed from the retainingtongues or lugs 24. 'Located inwardly in relation with the circularseries of apertures 22, and concentric therewith, i878. series oftriangular tongues 27, formed from the. material. of the carrier andprojected substantially perpendicular to the plane of such carrier,thereby forming a. circular succession of integral ratchet teeth onlateral face of the carrier. The teeth 27 of the carrier aresuccessively engaged by a' pawl 28 upon the extremity of an oscillatoryactuatorarm29, pivoted upon the stud 30, centrally disposed in theforward wall of the housing. The actuator arm 29 is provided with anextension 31 to which is connected the spring 32, which actuates the arm29 to move the transparency carrier when permitted to do so by therotation of the control cam 33. The actuator control cam 33, isperipherally engaged by an extension or finger 34, of the actuator arm,and is so shaped that when thecam reaches a predetermined point in itsrotation the actuator arm 29 is projected forwardly quite suddenly,under the influence of its spring 32, and carrying with it thetransparency carrier 17. To govern and cushion the stroke of theactuator 29, in order that momentum may not be imparted to thetransparency carrier sufiicient to effect an overthrow, the extension 31of the actuator is connected to a dash pot or governor cylin der 35.This cylinder is supported on a suitable stud, projecting from the wallof the housing. The piston 36 is connected to the actuator extension 31,and extends within the cylinder 35, which it fits rather loosely,permitting a limited amount of air leakage about the periphery of thepiston. It is obvious that a pin hole port or breathe hole in thecylinder 35 permitting slow escape of the 'air as the piston enters thecylinder under influence of the spring 32, would accomplish the sameresult and be the equivalent of the leakage of air about the piston.This dash pot construction or piston governor regulates the movement ofthe transparency carrier, by retarding the movement of-the actuator arm29 when the finger or extension 34 drops into the notch 33' of the cam.The cam 33 is of evolute form, caus-.

ing the actuator arm 29 to be gradually .re-

stored .or retracted preparatory to its next strpke,a fter havingdropped more or less quickly .mto the notch or recess 33' of the cam.The cam'33 is mounted upon astud 37, which also carries adjacent to thecam 33 and concentric with said cam, a second cam'member 38.' This cam38 controls an oscillatory shutter 39,, carried by an arm 40,pivotedupon the main stud 30, and having an extension or arm 41, ridingupon the periphery of the cam 38. concentric throughout the greaterportion of its periphery, thereby holding the shut- The cam 38 is ter 39stationary inits elevated or inopera- I tive position. Like the cam 33,the shutter car 38 is notched or recessed at 38'. The arm or extension41 of the shutter arm 40 rides-upon the periphery of the cam 38 until itdrops within the notch 38', upon rotation of the cam, which permits theshutter 39 to fall by gravity across the field of the lens, or intoregistry with the projecting position of the transparency. The shuttercam 38 is set or timed slightly in advance of the actuator cam 33. Bythis relation of the cams, the shutter 39 is dropped to its operativeposition, cutting ed the projection just before the actuator arm 29begins to move the transparency to present the next succeedingtransparency of the series in projecting position. The shutter cam 38 isso shaped as to recover or retract the shutter more quickly than theretraction of the actuat'or arm 29. However, the retraction of i theshutter 39 will be comparatively slow in relation with its movement intooperative '1 tion through the greater portion of the cam rotation orcycleperiod. The cams 33 and 38 are interconnected one, with another forrotation in unison, and are in" turn connected with a worm gear 42,mounted upon the stud 30 concentric with the cams. This worm gear 42 isdriven by the worm 43., carried by the shaft 44 upon a suitable bearing45, inthe housing 1. At its lower end the shaft 44 carries a frictiondrive wheel 46, engaged by a driving drum 47 upon the armature shaft 48of a driving motor 49. The motor 49 drives the shaft 44 and worm 43,continuously, thereby rotating the worm wheel 42,- and the control cams33 and 38 in unison. This continuous movement is translated intointermittent movement of the.

transparency carrier and the shutter, as the drop into t e respectivenotches 33' and 38'.

As the actuator arm 39 is retracted by the continued rotation of theevolute cam 33, the actuating pawl 28 will ride idly over the nextratchet tooth 27, which it will operatively engage to move thetransparency disc,

upon its succeeding operating stroke.

In lieu of providing the projecting tines or teeth 27 upon the lateralface of the transparency carrier 17, to be engaged by the pawl 28, theratchet teeth may be provided upon the inner circumference of theannular transparency carrier, by providing a series of internal notchesor saw teeth, shown at 50 in Fig. 8. The construction shown in Figs. 7and 8, facilitates the employment of multiple transparencies to be movedeither in unison or alternately to afford difi'erent scenic efi'ect,optical illusion, and novelty effects of projection. While in theconstruction previously describeda the actuating pawl 28 is mountedtransversely in relation with the plane of oscillation. of the actuatorarm 29 in order that the pawl 28 may engage the laterally projectingteeth 27 of the carrier, in the construction shown in Fig. 8, theactuating pawl 51 performs its functions in' a plane parallel with thatof the actuation arm and transparency carrier. By providing a pluralityof grooved guide rollers 18, 19 and 20, arranged side by side for theemployment of a plurality of transparency discs, such discs may beemployedjin multiple. For instance a succession of transparencies ofscenic character or pictorial views,-may be employed in combination witha second carrier having a succession of lettered or advertisintransparencies, by which the projection 0 one transparency might beimposed upon the reproduction of the other to afford novel screeneffects. These multiple transparencies being located closely adjacent,one to the other,

and operated by a single pawl 51, which in.

such case is made sufficiently broad to simultaneously engage two ormore of such trans.- parencies arranged in proximate relation to eachother. .In lieu of operating the transparency screens in unison and inthe same direction, each of two such screens may be advancedintermittently in opposite directions by providing ratchet teeth 50 ofthe respective carrier in reverse relation and providing upon theactuator arm 29, a sec- 0nd pawl 52, turned in direction opposite tothat of the pawl 51, .as shown in Fig. 7.

In such construction, the main transparency carrier 17' will be advancedin the normal direction of movement as the actuator arm 29 performs itsoperative stroke when released by the control cap.33. During suchmovement, the second pawl 52 will ride idly over the ratchet teeth 50 ofthe second transparency carrier 53. However, upon the return orretractive movement of the actuator arm 29, the pawl 52 engaging withthe teeth of the repetitious program.

50 of the second transparency carrier 53, will advance such carrier alike step in the reverse direction. In such construction, the secondtransparency carrier 53 is preferably a color screen of a mottledcharacter, wherein the different color areas blend or merge one toanother. The effect of such movingconnected with the cam shaft by meansofthe worm drive, without the intermediary of the friction disc anddrum.

The actuating cams have been shifted to a different position in relationwith the center of oscillation of the actuator arm and shutter arm andoperate upon these arms at the oppositev side of said pivotal centerfrom that shown in the preceding figure. The releasable guide roller forthe transparency car rier is differently located to insure thetransparency being maintained in its proper plane during the projectionperiod.

Referring to Figs. 10 and 11, the driving motor 49 is shown upended andseated in the base or pedestal 55, which projects forwardly beyond thefront of the projection chamber 1, the wall of the projection chamberbeing indented as at 56 Fig. 11 to accommodate the rear side of themotor. The driving worm 43 is carried directly upon the armature shaftof the motor and engages with the worm gear 42 upon the rotary cam shaft37', which" carries the cams 33 and 38. The worm drive is enclosed in acompartment or hollow boss projecting forwardly from the wall of theprojection chamber.

l/Vhereas the preceding figures show the actuating arm and shutter armas levers of the third class, in Fig. llthese members are shown aslevers of the first class. The operating cams 33 and 38 have beenshifted from a position below the center of oscillation to one inhorizontal relation therewith and these cams engage'arms or tails 57 ofthe actuating lever 29 aucl' shutter arm 40. In the present instance,the actuating arm cam 33, is shaped slightly different from that in thepreceding figures, so that it retains slight control of the actuatingarm 29' during its operative stroke. To this end the shoulder or offsetof the evolute cam is not so abrupt as that shown in precedin isdirected at a slight inclination to the radius so-that the tail 57 ofthe actuating arm does not drop free of the cam, but the arm ispermitted to move forward only as the 'cam rotates. The spring 32 iscon-' nected directlv to the actuating arm 29'. and serves to oscillatethe arm when permitted to do so by the rotation of the control cam 33.With the exception noted, the shutter arm 40 operates exactly as beforedescribed. The inner circumference of the transparency disc or carrieris provided with marginal triangular teeth 59, in lieu of the notches50, previously described. These teeth 59 are engaged by a pawl orpivoted finger 60, carried by the end of the actuator arm 29' to advancethe carrier disc at each oscillation of .the arm. This actuating pawl 60is supported free of that portion of the carrier margin intermediate theteeth 59., by the pin 61 upon the arm 29. Thus the pawl finger 60engages only the projecting teeth 59 and during its retrograde movementand its in-' itial advance into engagement with the tooth, it isnotpermitted to ride upon the inner marginal edge of the carrier. Thepurpose of this is not only to avoid wear but also to prevent anyfrictional retraction of the carrier and particularly to prevent thepawl fromengaging with a burr or any slight roughness of the carriermargin, which might effect an untimely movement of the carrier disc.

Coincident with the projecting position, there is stationarily mountedin the housing 1, a mask or framing plate 62, having an aperturetherein, with which the transparencies 23 to be projected are registeredat each operation. A corresponding framing plate or mask is also foundin the construo tion shown in preceding figures. However, in the presentinstance, a guide roller 20 is mounted upon a fixed pivot upon thisplate 62, and engages the peripheral edge of the carrier disc 17. Thecarrier guide roller 19' in the present instance is mounted upon anoscillatory lever 21', actuated by the spring 63 to facilitate theengagement and disengagement of the carrier disc with the guide rollers.The location of the ylelding roller 19 at a point removed fromprojecting position and the substitution of the roller 20 upon astationary trunnion stud in lieu of the swinging arm shown in thepreceding construction insures the maintenance of the disc andtransparencies in predetermined plane during the projection period.Otherwise any undue looseness or side play of the swinging arm 21 mightpermit the transparency to be moved to and fro out of focus.

The several guide rollers for the carrien disc are preferably though'-not necessarily made of bakelite or other phenolic condensation materialand for the purpose of lubrication, are charged with graphite." Suchphenolic condensation material will not readily change with differenttemperature or moisture conditions, and has wear resistant qualitieswhich well adapt the material for this purpose.

In order to insure uniformity of the speed of the driving motor 49, asimple form of governor may be provided such as shown in detail in Figs12 and 13. This speed regulator or governor device is located on thelower end of the armature shaft and within the base 55 (Fig. 10). Itconsists of a col-- lar head 64 carrying integral "radial arms 65attached to the ends of which are short lengths 66 of rawhide, .leatheror other flex ible frictional material. Located 'on a base plate 67 andconcentric with the armature shaft and rotating arms 65 is a series ofpins or studs 68 located just beyond the circular path of the ends ofthe arms 65. These pins or studs 68 may be parallel with each other andwith the axis of rotation of the governor but are preferably slightlyinclined to each other and to the axis of rotation. The centrifugalinfluence as the governor arms 65 rotate tends to flex the leather orraw hide strips or fingers outwardly beyond the studs or pins 68 so thatthese flexible fingers have a wiping contact. An increase of speedthrows the flexible fingers outward to greater degree causing them topartially wrap about the studs or pins 68 thereby increasing theyielding resistance. By adjusting the collar or head 64 to higher orlower level upon the motor shaft, the effect of the governor may beregulated by causing the fingers to engage the tapered pins upon longeror shorter radius.

While the apparatus hasheretofore been described as adapted forpreceding and succession of diiferent advertisements and signs eachindependentof the other it is to be understood that a succession oftransparencies may be inter-related. These mayconsist of a series ofpictures and comprising a succession of screens progressively arrangedor each transparency may consist of. a single word or a series of wordswhich, with the words on preceding and succession transparencies, formcomplete sentences. In such event the transparency would be'small in.

enumerated as desirable, but which obviously is susceptible ofmodification in 1ts form, proportions, detail construction andarrangement of parts without departing from the principle involved orsacrificing any of 1ts advantages.

While in order to comply with the statute the invention has beendescribed in language more or less specific as to structural features,

it is to be understood that'the invention is not limited to the specificdetails shown, but that the means and construction herein disclosedcomprises the preferred form of several modes of putting the inventioninto effeet and the invention is, therefore, claimed in any of its formsor modifications within the le itimate and valid scope of the appendeclaims.

Having thus described my invention, I claim:

1. In a rojecting apparatus of the character described, the combinationwith a projection lantern, a projection lens and a source ofillumination of an annular rotary transparency carrier rotating in avertical plane, means for peripherally supporting the rotary carrier, acontinuous succession of independent transparencies detachably mountedupon the carrier, a vibratory actuating arm mounted concentrically withthe carrier, means for actuating the arm for automatically rotating thecarrier through a step by step movement, by which the transparencies aresuccessively presented in pro- 'ecting position, a motor drivencontinuously rotating cam actuator for the vibratory arm, and means forretarding the actuating stroke of the vibratory arm.

2. In a projecting apparatus, the combination with a projecting lantern,including a projection lens, and a source of illumination, of atraveling carrier for a plurality of transparencies, a series oflndependent transparencies detachably mounted upon the carrier, a springactuated oscillatory arm, and an actuating spring therefor forintermittently advancing the carrier to present the transparencies inpredetermined. quence in projecting position and a rotating cam forretracting the arm against the tension of the spring, said actuatingmechanism-being located wholly within the periphery of the carrier, anda governor member regulating the advance movement of the carrier. .1:

3. In a projecting apparatus, the combination with a projecting lantern,including a projection lens, and a source of illumination of a pluralityof independent interchangeable transparencies, an annular revolublecarrier for such transparencies, means for peripherally supporting thecarrier, an oscillating arm mounted concentrically with the carrier forintermittently adjustingthe carrier to present the transparencies inprerelative to said lens and source of illumination and a motor drivencam located within the periphery of the carrier for retracting the arm,an actuating spring for the arm, and means for yieldin ly resisting theactuating spring and con ing the arm to slow movement.

4. In a projecting apparatus, the combination with a projecting lantern,including a projection lens, and a source of illumination, a carrierhaving therein a plurality of framing apertures for transparencies, andrelatively fixed retaining tongues located in approximate relation withthe opposite edges of the framing apertures and engageable in terminalnotches of a removable transparency overlying the framing aperture andprojecting beneath such tongues to hold the transparency in adjustedrelation with theopening, and means to adjust the carrier to present thetransparencies in sequence in projecting position.

5. In a projecting apparatus, the combination with a projecting lantern,including a projection lens, and a source of illumination, a carrierhaving therein a plurality of framing apertures for flexibletransparencies, a plurality of independent transparencies, andoverhanging stop projections for detachably securing a transparency inregistry with each of the framing apertures beneath which the oppositeends of a transparency are engageable byflex-ing the transparency, andmeans to adjust the carrier,

to present the transparencies in predetermined sequence in projectingposition.

6. In a projecting apparatus, the combination with a projecting lantern,including a projection lens, and a source of illumination, a carrierhaving therein a plurality of framing apertures for transparencies,projections at opposite sides of the respective apertures for engagementof the transparencies, and. a plurality of independent transparencieseach having marginal notches to straddle said projections to detachablysupport the transparencies upon the carrier, and means to adjust thecarrier to present the transparencies in predetermined sequence inprojecting position.

7. In a projecting apparatus, the combination with a projecting lanternincluding a projection lens and a source of illumination, of a carrierfor transparencies having therein a plurality of framing apertures aplurality of independent transparencies detachably mounted upon thecarrier, retaining tongues on the carrier overhanging the opposite edgesof the detachable transparencies said transparencies being marginallynotched coincident with the points of engagement of the overhangingtongues whereby the adjacent marginal portions of the transpar enciesstraddle such overhanging tongues to interlock the transparencies inregistry with the framing apertures and means for adjusting the carrierto present the transparencies inapredetermined sequence in projectingposition. 7

8. In a projecting apparatus, the combi nation with a projecting lanternincluding a projection lens and a source of illumination, of an annularcarrier for transparencies having therein a plurality of framingapertures,

a plurality of independent transparencies detachably mounted upon thecarrier, in registry with the framing apertures, and presented inprojection position by the adjustment of the carrier, the carrier beingopened interiorly of the plurality of apertures, and means forperipherally supporting the annular carrier for rotation in a verticalplane, a succession of ratchet teeth upon the carrier, an oscillatoryarm pivoted substantially concentrically with the carrier, a pawlcarried by the arm and operatively engaging the ratchet teeth to advancethe carrier, and means for oscillating the arm.

9. In a projecting apparatus, the combination with a projecting lanternincluding a projection lens and source of illumination, of an annularrevoluble carrier for transparencies, a succession of images to beprojected carried thereby, and presented in projecting position by theadjustment of the carrier, means for peripherally supporting the annular carrier for rotation in a vertical plane, an oscillatory actuatorarm pivoted within the circle of such annular carrier, an actuating pawlcarried by the arm, a series of ratchet teeth located in proximity tothe inner circumference of the carrier and progressively engaged by thepawl, a rotary evolute cam controlling the movement of the arm and meansfor rotating the cam.

10. In a. projecting apparatus, the, combination with a projectinglantern including a projection lens and source of illumination, of amovable carrier for transparencies, a succession of images to beprojected carried thereby, and presented in projecting position by theadjustment of the carrier, an oscillatory actuator arm, an actuatingpawl carried by the arm, a series of ratchet teeth upon the carrier andprogressively engaged by the pawl, a dash pot governor for said arm,governing the operative stroke of the arm, and means for retracting thearm for each succeeding operation. i

11. In a projecting apparatus, the combination with a projecting lanternincluding a projection lens and source of illumination, of a movablecarrier for transparencies, a succession of images to be projectedcarried thereby, and presented in projecting posi-- tion by theadjustment of the carrier, an os-illatory actuator arm, an actuatingpawl carried by the arm, a series of ratchet teeth upon the carrier andprogressively engaged by the pawl, an actuating spring for the arm,yielding means for governing the stroke of the arm under influence ofits spring when released, and means for retracting the arm against thetension of the spring after each actuation of the carrier preparatory tothe next operation.

12. In a projecting lantern, the combination with a projecting lens anda source of illumination of a traveling carrier for images to beprojected, means for intermittently advancing the carrier through a stepby step movement, including an oscillatory actuating arm, means foroperatively engaging the arm with the carrier during its movement in onedirection, the retrograde movement of the arm being independent of thecarrier, means for controlling said arm by which its speed in onedirectionis greater than its speed in the reverse direction, andyielding means governing the operative stroke of said arm.

13. In a projecting apparatus, the combination with a projecting lanternincluding a projection lens and a Source of illumination, a plurality ofconcentrically disposed revoluble transparency carriers, an oscillatoryactuator arm common to the plurality of carriers, means for actuatingthe arm and illumination, of a traveling carrier for images to beprojected, means for intermittently advancing the carrier through a stepby step movement to present the images progressively in projectingposition, a shutter interposed in the line of projection during thechange of position of said images by the adjustment of the carrier, anoscillatory arm upon which the shutter is carried and rotary camcontrolling said arm so, contoured and timed as to permit the shutter todrop quickly into its operative position in a direction correspondingtothe movement of the carrier and is subsequently slowly retractedtherefrom in a direction the reverse of the movement of the carrier, andmeans to rotate the cam; i

15. In a projecting lantern, the combination with a projecting lens anda source of illumination, of a traveling carrier for images to beprojected, means for intermit tently advancing the carrier through astep by step movement to present the images progressively in projectingposition, a shutter interposed in the line of projection during thechange of position of said images by the adjustment of the carrier, andmeans controlling the movement of the shutter into and out of operativeposition through a path present the images progressively in projectatingarm intermittently advancing the carrier through a step by step movementto ing position, a shutter interposed in the line of pro'ection duringthe change of pos1t1on of sai images by the adjustment of the carrier,and a second oscillatory arm mounted concentrically with the oscillatoryactuating arm operatively connected with the shutter by which theshutter is moved in a path substantially parallel with that of thecarrier, and means common to both arms for retracting the arms andreleasingthem for independent movement in predetermined timed relation.

'17. In a projecting apparatus, the combination with a projectinglantern, including a projection lens and a source of illumination, aplurality of concentrically disposed revoluble transparency carriers, anoscillatory actuator arm common to the plurality of carriers, and meansengaging the arm alternately with the respective carriers for advancingthe carriers in reverse directions through a step by step movement pastthe point of projection.

18. In a projecting apparatus, the combination with a projecting lanternincluding a projection lens and a source of illumina tion, a pluralityof concentrically disposed revoluble transparency carriers, anoscillatory actuator arm common to the plurality of carriers, means foractuating the arm and means operatively engaging the arm with thecarriers to intermittently advance the carriers through step by stepmovements, one by movement of the arm in one direction and another bythe return movement of the arm, to present successive portions of thecarriers past the point of projection.

19. In a projecting apparatus, the combination with .a projectinglantern including a projection lens, and a source of illumination, twotraveling transparency carriers movable in parallel paths of travel, andmeans for intermittently advancing the carriers through a step by stepmovement, past the point of projection in superposed relation, wherebythe projected light beam passes slfccessively through transparenciescarried by each carrier. 1

20. In a projecting apparatus, the combination with a projecting lanternincluding a projection lens, and a source of illuminabination with aprojecting lantern including a projection lens, and a source ofillumination, two traveling transparency carriers movable in parallelpaths of travel, and

means for advancing said carriers in opposite directions througha stepby step movement past the projection point in su erposed. relationwhereby the projection lig t beam passes successively throughtransparencies, carried by each carrier.

22. In a projecting lantern, the combination with a projecting lensanda. sourceof illumination, of a circular carrier for images to beprojected, a series of rollers upon which the periphery of the carrierrests for rotary motion, one of said rollers being yieldingly mounted tofacilitate the disengagement and engagement of the carrier therewith,and means for transmitting motion to said carrier.

23. In a projecting lantern, the combination with a projecting lens, anda source of illumination, of two movable transparencies positioned onebefore the other in the line of projection, and intermittently operativeactuating means common to both transparencies for moving thetransparencies into and out of projecting position.

24. In a projecting lantern, the combination with a projecting lens, anda source of illumination, of two circular transparency carriers locatedside by side, each in parallel proximate relation to each other, andmeans for actuating said carriers alternately to present differentportions of the respective transparencies carried thereby simultaneouslyin projecting position. 7

25. The combination with aprojecting lantern, of a plurality ofindependent trans arencies simultaneously presented in proectingposition, in superposed relation whereby the projecting light beampasses successively through each of the transparencies and means commonto both transparencies for moving said transparencies intoand out ofprojecting position.

26. The combination with a projecting lantern, of a plurality ofindependent transparencies simultaneously presented in projectingposition, in superposed relation whereby the projecting light beampasses successively through each of the transparencies, and means foralternately shifting said transparencies into' and out of projectingposition.

27. The combination with a projectinglanating said transparencies inreverse directern, of a plurality of independent transpartions throughstep by step movement into encies simultaneously presented inproj-eetand out of projecting posit-ions. in position, in superposedrelation whereby In testimony whereof, I have hereunto set 5 theprojecting light beam passes succesmy hand this 12th day of June A. D.1928.

sively through each of the transparencies, and intermittently operativemeans for act/u v PAUL A. NOTHSTINE.

